Default Gateway is 0.0.0.0 as well as correct address

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So, for some unknown reason, your workstations that were working fine before now are getting a Gateway of 0.0.0.0 IN ADDITION to the proper Gateway, but the default is 0.0.0.0 so they can’t get online.
  1. Get to a DOS prompt as an Administrator
  2. Type route delete 0.0.0.0 and hit enter
  3. Type ipconfig /release and hit enter
  4. Type ipconfig /renew and hit enter